Alvarez, Walter. A Most Improbable Journey: A Big History of Our Planet and Ourselves. Norton. Nov. 2016. 288p. ISBN 9780393292695. $26.95. SCIENCE/COSMOLOGY If you’re familiar with the “Impact Theory,” which blames dinosaur extinction on a crash-landed asteroid, then you’re familiar with Berkeley geologist Alvarez; he originated the idea. Here he argues that Big History, which […]